Sento function error in UDP protocol

Good I put you a little in situation to see if someone can help me. I'm trying to communicate two computers using a UDP protocol. One computer has a Windows operating system and the other is a Raspberry Pi with Raspbian. The Raspbeery Pi works as a client and the Windows computer works as a server.

I have the problem at the moment of executing the programs. Communication in the direction of the Raspberry Pi to the computer works fine, but not the other way around. I get an error with the sendto function from the server, and when doing the WSAGetLastError () function I get the error 10049 and I do not know how to solve it.

Here I leave the codes in case someone can help me.

Client

#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include "ReadWriteSock.h"
#include "changetypes.h"
#include "Socket.h"
int main(){
struct sockaddr_in Directionwrite;
//struct servent *Puerto;
//struct hostent *Host;
char pressure[5]="3.42";
char servo[5];
float fpressure, fservo;
int Descriptor,aux;


Directionwrite.sin_family = AF_INET;
Directionwrite.sin_addr.s_addr=inet_addr("169.254.51.37");
Directionwrite.sin_port=htons(49205);

do{Descriptor = socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP);
}
while(Descriptor==-1);


do{
    aux=connect (Descriptor, (struct sockaddr *)&Directionwrite, sizeof (Directionwrite));
}
    while(aux==-1);
    aux=sizeof(Directionwrite);
writeSocket(Descriptor,pressure,strlen(pressure);
int b=recvfrom(Descriptor, servo, 5, 0, (struct sockaddr *) &Directionwrite, &aux); //Tengo el error 10049
//readSocket(Descriptor,servo,4);
printf("Hemos recibido el valor: %s", servo);
close(Descriptor);
return 0;
}

And now here's the server code:

#include <winsock.h>
#include <stdio.h>
int main()
{
WSADATA wsaData;
SOCKET RecvSocket;
struct sockaddr_in RecvAddr;
int Puerto = 49204;
char RecvBuf[5];
char SendBuf[5]="Hola";
struct sockaddr_in SenderAddr;
int SenderAddrSize = sizeof(SenderAddr);
WSAStartup(MAKEWORD(2,2), &wsaData);
RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
RecvAddr.sin_family = AF_INET;
RecvAddr.sin_port = htons(Puerto);
RecvAddr.sin_addr.s_addr = INADDR_ANY;
bind(RecvSocket, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr));
recvfrom(RecvSocket,RecvBuf, 5, 0,(SOCKADDR *)&SenderAddr,&SenderAddrSize);
printf("Hemos recibido %s\n",RecvBuf);
// Ahora vamos a enviar un dato
int i=sendto(RecvSocket,SendBuf,strlen(SendBuf)+1,0,(SOCKADDR *) &RecvAddr,sizeof(RecvAddr));
if(i==-1){
    printf("The error is %d", WSAGetLastError());
}
closesocket(RecvSocket);
WSACleanup();
}

The error I get in this last code when doing the sendto function, receives the client data well. And as I said before, the error that the sendto gives me after using the function WSAGetLastError () is 10049. Thanks in advance.